Improvement in treadle-motion



UNITED STATES PATENT OFFICE.

YnvlPnovEMeNT IN TREADLE-Morion;`

Specification forming part of Letters Patent No. 47,282, dated April 18, `1865.

, To all whom it may concern:

Be it known that I, ALBERT L. DEWEY, of Westfeld,in the county of Hampden and State of Massachusetts, have invented a new and ImprovedTreadle-Motion; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specication, in Which- Figure lis a vertical sectionoi' my invention, taken in the line x w, Fig. 2,; Fig. 2, a transverse section of the same, taken in the line y y, Fig. l; Fig. 3, the saine view as Fig. 2, showing a modification of the invention; Fig. 4, a detached view of a spring pertainin to the same.

Similar letters of reference indicate corresponding parts. l

This invention relates to a new and improved treadle-motion designed for turninglathes, sewing-machines, and all other devices in which motion is given a rotating shaft through the medium of a foot-treadle.

A represents a shaft ,supported by va fraining, B, and having two bosses, C C, upon it,` rabbeted or grooved at their peripheries to receive a hollow or tubular hub, D, which is fitted loosely on the hubs or bosses C C, the il-.ingcs a, formed by the rabbets or grooves in the latter, preventing the hub from moving Y laterally thereon, as will be understood by referring to Fig. 1.

E is a spiral spring, which is placed ou the shaft A between the two bosses C C, and coning through the flanges c c, and about centrally through the jaw or clamp, one end of G- being formed with a lip, d', and the other end having a set-screw, e, passing through it, by adjusting'which the lip d may be pressed snugly down on the belt, firmly securing the` `latter to the hub. (See Fig. 2.) .The lower end of the belt F is secured to the treadle F* by means of a clamp, G, constructed iu a simi-` lar manner, said clamp being fitted on a pivot, f, in a plate, g, which is secured to the upper surface of the treadle; and has a portion ofits upper surface corrugated, as shown at h. One

end of the plate g is provided with a loop or eye, t', through which the `belt F passes, and underneath one end of the clamp, which end is also corrugated, and is made to press firmly down upon the belt by means of a screw, j, passing through the opposite end of Gr and bearing upon the eye fi, as shown in Fig. 2.

H is a spiral spring, which is connected to the hub D, so as to act upon it in a direction contrary to the belt F.

The operation is as follows: The action of spring E is peculiar. When the treadle Fx is pressed downward under the action of the foot the belt F will turn the hub D in the direction indicated by arrow l in Fig. 2, and spring E will be contracted and bear upon the shaft A, so as to cause it to rotate also, the spring form-` ing the only connection between the shaft A-` and the hub D. Theinstant that the pressure is removed from the treadle Fx the spring E relaxes and allows .theshaft A to continue its l rotation, while the hub D is allowed to turn in the opposite direction under the contraction of spring H, the latter having been distended during the downward movementof the treadle.

The backward movement of hub D windslthe i belt F upon it and raises the treadle F", ready i for a succeeding downward movement.

In certain cases the belt F may be dispensed with and a rod, I, substitutedfas shown in` Fig. 3, said rod being attached to a treadle, y

pose set forth.

` ALBERT L. DEWEY.

Witnesses:

Mrs. HELEN L. DEWEY, WILLIAM W. TUGKETT. 

